package org.test.config;

import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
@Configuration
public class JsonConfig {
	@Bean
	public HttpMessageConverters customConverters() {
		FastJsonHttpMessageConverter converter = new FastJsonHttpMessageConverter();
		FastJsonConfig config = new FastJsonConfig();
		config.setSerializerFeatures(
				// 保留map空的字段
				SerializerFeature.WriteMapNullValue,
				// 将String类型的null转成""
				SerializerFeature.WriteNullStringAsEmpty,
				// 将Number类型的null转成0
				SerializerFeature.WriteNullNumberAsZero,
				// 将List类型的null转成[]
				SerializerFeature.WriteNullListAsEmpty,
				// 将Boolean类型的null转成false
				SerializerFeature.WriteNullBooleanAsFalse,
				// 避免循环引用
				SerializerFeature.DisableCircularReferenceDetect);

		converter.setFastJsonConfig(config);
		converter.setDefaultCharset(Charset.forName("UTF-8"));
		List<MediaType> mediaTypeList = new ArrayList<>();
		// 解决中文乱码问题，相当于在Controller上的@RequestMapping中加了个属性produces = "application/json"
		mediaTypeList.add(MediaType.APPLICATION_JSON);
		converter.setSupportedMediaTypes(mediaTypeList);
		return new HttpMessageConverters(converter);
	}
}
